The factory plastic diverter valve is notoriously weak

and Pro S models

By installing these performance parts

Premium Billet Construction: CNC-machined from solid 6061 Billet Aluminum for maximum strength and leak-free reliability

or running high-performance ECU flashes on your XP Turbo or RS1

Power Vision 3 + Tune / General 1000 Select Tune level:Level 2 The factory plastic diverter valveGeneral XP1000 models Device Features: Flash performance tunes via OEM diagnostic connector, no need to remove and send out ECU Display vehicle data channels in real time Weather resistant for use in all conditions High contrast display, visible in direct sunlight For updating tune files or receiving your tune via email you must use PC. Will not work on MAC BMP Performance Tunes: Fueling revised for maximum power and torque extreme horsepower gains